PDA

View Full Version : whats wrong with this picture



1fst400
01-04-2007, 04:42 PM
Why does my 04 450r with hotcams stage2. Lrd slip on pipe. 180 main jet, stock needle on 4th clip doun I think... Uni filter. no air box lid, ceramic coated head pipe, Knoby 18"tires. Only make 35.2 Hp and 26.9 ft lbs of torque.


the guy said to ignor the a/f max because that was when he stabed the throttle on or somthing.

1fst400
01-04-2007, 04:44 PM
dynojet dyno by the way.

honda300EXtreme
01-04-2007, 04:46 PM
those are decent #'s but also you shouldnt run knobbies on the dyno!, a higher rev box might help some also, but if its fast who cares

1fst400
01-04-2007, 05:30 PM
Just making shure i dont have a lemon on my heads. seeings how I did a quick search and found that a stock 05 450r had 36 made me woried.!

K_Fulk
01-04-2007, 06:07 PM
Knobbies on the dyno will lower your numbers.

1fst400
01-04-2007, 06:50 PM
I knew that. but do you know how much


How does my A/F ratio lool. what would one of you pros recomend.

bradley300
01-05-2007, 08:10 AM
13.5 to 1 is the proper a/f ratio

MXin700R
01-05-2007, 09:56 AM
Why did he start the pull at such a high RPM? The A/F is amiss somewere, shoulda cleared up alot quicker than that. Knobbies, depending on how much tread and design is on em, will rob anywere from 3 and up- I ran mine on the dyno with knobbies and got 54.9rwhp/50.1rwtq and Im gonna go back and run on slicks and see what the difference is. Also, is this SAE #s or what?

Mobile Dyno
01-08-2007, 04:24 AM
whats wrong with this picture


You will see loss of HP when running knobbies. With the mods you have you are around 38-39hp with slicks. 04' 450 Stock is 33hp. So with running knobbies 35hp sound right on a dyno.

The graph look like that because the operator started the run to high in the rpm range. Also could be that the knobbies spun on the drum at the start of the run an the TQ lead didn't pick up until 6K. As for A/F and what he told you:confused: , to me if that what a hp run, then the A/F is showing that you main is to rich.

bwamos
01-10-2007, 10:52 AM
Agree,
Main's rich (12:1):eek: , needle is a hair lean (small enough it may just need a shim instead of a full adjustment, but after upping the main it will proabably balance out).

bwamos
01-10-2007, 11:00 AM
You're engine's dogging a bit up top because it's too rich.

You want to aim for this.

Mobile Dyno
01-11-2007, 04:21 AM
Just to let everyone know, that A/F graphs does not show needle. It is a HP run which is a Main jet test WOT. The needle has to be tested different.

I wouldn't even use that graph to try and tune. It starts at 6K rpm and has 200 rpm intervals. Doesn't really show anything. I am sorry this is what they gave you and you payed for this:mad:

1fst400
01-11-2007, 05:59 AM
Alright, now I know not to go back to that place. It was a little bit of a bum hang out. I did however pay 150$ for everything. Seemed okay at the time, but now it seems I dident get what I paid for.

The quad seems to run good anyways... Seemed like it had lots of power to me and didnet seem to bog at all when I was at mototown.

Mobile Dyno
01-11-2007, 08:25 AM
You have more power there with the right tuning. I bet if you pull your plug it would show rich(black). HRC needle does better in that carb. Are you running airbox lid on or off?

scruff_mcruff
01-14-2007, 01:06 AM
Originally posted by bradley300
13.5 to 1 is the proper a/f ratio

says who? there are so many things to consider for a/f ratio that each and every motor has its on proper ratio.

MXin700R
01-14-2007, 08:12 AM
True, depending on the engine setup and what the end results are favored for. Mine had more HP but less torque when I went leaner than 12.6-13.0 and I wanted to keep as much torque as I could so I got a happy medium of the two which as at an average of 12.9:1, I spoke with Mobile Dyno and he has seem the same thing out of the 700s- they prefer to be just a tad richer than some of the other bikes.

1fst400
01-14-2007, 08:41 AM
no air box lid was used in the dyno runs.

450rXtreme
01-20-2007, 08:34 PM
He is right 13.4- 13.6 a/f is the optimal ratio for maximum torque in most engines. Your A/F to me looks lean in low end and rich on top stating the obvious but yeah. IMO I would run a bigger pilot jet and a smaller mainjet.